Pick a dairy product (5)
I believe the answer is:
cream
This clue is a double definition.
'pick' is the first definition.
(I know that pick can be written as cream)
'a dairy product' is the second definition.
(I know that cream is a type of dairy product)
(Other definitions for cream that I've seen before include "The best part -of the crop" , "Elite; pale yellow" , "Best - substitute for shaving soap" , "Top of milk or society" , "Elite; colour" .)